I want to know about the working and internal structure of mq 6 sensor
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The MQ 6 gas sensor is used as LPG, butane and propane sensor to generate alarm when there are leaks of these gases from the source. MQ6 is a gas sensor very sensitive to gases based on petroleum, but less sensitive to alcohol and carbon dioxide. This simple sensor can be installed in the kitchen to give warning alarm if there is LPG leakage.
The MQ6 gas sensor is a 6-pin device and requires a maximum of 5 volts DC that is derived from a Zener-based power supply. There is a heating element inside the sensor that heats up to 5 volts and remains at rest. When the sensor detects gas molecules between 100 ppm and 1000 ppm in the atmosphere, its output rotates and activates T1 to activate the buzzer. The red LED indicates the high output of the sensor.